dhclient намного больше, чем 10 сек. (в первый раз так же было)
root@Z77pro3Ubuntu:~# rmmod r8169
root@Z77pro3Ubuntu:~# modprobe r8169
root@Z77pro3Ubuntu:~# dhclient eth0
root@Z77pro3Ubuntu:~# dmesg | tail -20
[ 212.780786] sd 6:0:0:0: [sdb] Write Protect is off
[ 212.780791] sd 6:0:0:0: [sdb] Mode Sense: 03 00 00 00
[ 212.781082] sd 6:0:0:0: [sdb] No Caching mode page present
[ 212.781088] sd 6:0:0:0: [sdb] Assuming drive cache: write through
[ 212.782762] sd 6:0:0:0: [sdb] No Caching mode page present
[ 212.782767] sd 6:0:0:0: [sdb] Assuming drive cache: write through
[ 212.784050] sdb: sdb4
[ 212.785224] sd 6:0:0:0: [sdb] No Caching mode page present
[ 212.785229] sd 6:0:0:0: [sdb] Assuming drive cache: write through
[ 212.785232] sd 6:0:0:0: [sdb] Attached SCSI removable disk
[ 506.527328] r8169 0000:05:00.0: PCI INT A disabled
[ 510.297944] r8169 Gigabit Ethernet driver 2.3LK-NAPI loaded
[ 510.297966] r8169 0000:05:00.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
[ 510.298017] r8169 0000:05:00.0: setting latency timer to 64
[ 510.298115] r8169 0000:05:00.0: irq 43 for MSI/MSI-X
[ 510.298570] r8169 0000:05:00.0: eth0: RTL8168evl/8111evl at 0xffffc90000068000, bc:5f:f4:49:44:68, XID 0c900880 IRQ 43
[ 510.298574] r8169 0000:05:00.0: eth0: jumbo features [frames: 9200 bytes, tx checksumming: ko]
[ 510.404107] r8169 0000:05:00.0: eth0: link down
[ 510.404860] ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 510.405179] ADDRCONF(NETDEV_UP): eth0: link is not ready